CentOS 6的服务器后执行yum后发现出现Error: Cannot find a valid baseurl for repo: base解决办法
原因是CentOS 6已经随着2020年11月的结束进入了EOL（Reaches End of Life），官方便在12月2日正式将CentOS 6相关的软件源移出了官方源，随之而来逐级镜像也会陆续将其删除。
不过有一些老设备依然需要维持在当前系统，CentOS官方也给这些还不想把CentOS 6扔进垃圾堆的用户保留了各个版本软件源的镜像，只是这个软件源不会再有更新了。
CentOS官方Vault源：http://vault.centos.org/
首先把fastestmirror关了，这个插件默认会寻找离你最近的镜像站去访问：
vi /etc/yum/pluginconf.d/fastestmirror.conf
修改这个参数enable=0
备份CentOS6系统源
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
将下面的内容复制进去 vi /etc/yum.repos.d/CentOS-Base.repo
# CentOS-Base.repo # # The mirror system uses the connecting IP address of the client and the # update status of each mirror to pick mirrors that are updated to and # geographically close to the client. You should use this for CentOS updates # unless you are manually picking other mirrors. # # If the mirrorlist= does not work for you, as a fall back you can try the # remarked out baseurl= line instead. # # [base] name=CentOS-6.9 - Base - vault.centos.org failovermethod=priority baseurl=http://vault.centos.org/6.9/os/$basearch/ gpgcheck=1 gpgkey=http://vault.centos.org/RPM-GPG-KEY-CentOS-6 #released updates [updates] name=CentOS-6.9 - Updates - vault.centos.org failovermethod=priority baseurl=http://vault.centos.org/6.9/updates/$basearch/ gpgcheck=1 gpgkey=http://vault.centos.org/RPM-GPG-KEY-CentOS-6 #additional packages that may be useful [extras] name=CentOS-6.9 - Extras - vault.centos.org failovermethod=priority baseurl=http://vault.centos.org/6.9/extras/$basearch/ gpgcheck=1 gpgkey=http://vault.centos.org/RPM-GPG-KEY-CentOS-6 #additional packages that extend functionality of existing packages [centosplus] name=CentOS-6.9 - Plus - vault.centos.org failovermethod=priority baseurl=http://vault.centos.org/6.9/centosplus/$basearch/ gpgcheck=1 enabled=0 gpgkey=http://vault.centos.org/RPM-GPG-KEY-CentOS-6 #contrib - packages by Centos Users [contrib] name=CentOS-6.9 - Contrib - vault.centos.org failovermethod=priority baseurl=http://vault.centos.org/6.9/contrib/$basearch/ gpgcheck=1 enabled=0 gpgkey=http://vault.centos.org/RPM-GPG-KEY-CentOS-6
更换源后尝试yum update，能够正常获取软件列表即可。
原文链接:http://diannaobos.com/post/983.html
